(a) Evaluate the line integral ∫ C F ⋅ d r , where F ( x , y , z ) = x i − z j + y k and C is given by r ( t ) = 2 t i + 3 t j − t 2 k , − 1 ≤ t ≤ 1 . (b) Illustrate part (a) by using a computer to graph C and the vectors from the vector field corresponding to t = ± 1 and ± 1 2 (as in Figure 13).
(a) Evaluate the line integral ∫ C F ⋅ d r , where F ( x , y , z ) = x i − z j + y k and C is given by r ( t ) = 2 t i + 3 t j − t 2 k , − 1 ≤ t ≤ 1 . (b) Illustrate part (a) by using a computer to graph C and the vectors from the vector field corresponding to t = ± 1 and ± 1 2 (as in Figure 13).
Solution Summary: The author evaluates the line integral of F along C by using the power rule of differentiation.
(a) Evaluate the line integral
∫
C
F
⋅
d
r
, where
F
(
x
,
y
,
z
)
=
x
i
−
z
j
+
y
k
and C is given by
r
(
t
)
=
2
t
i
+
3
t
j
−
t
2
k
,
−
1
≤
t
≤
1
.
(b) Illustrate part (a) by using a computer to graph C and the vectors from the vector field corresponding to
t
=
±
1
and
±
1
2
(as in Figure 13).
With integration, one of the major concepts of calculus. Differentiation is the derivative or rate of change of a function with respect to the independent variable.
A net is dipped in a river. Determine the flow rate of water across the net if the velocity vector field for the river is given by
= (x - y, z + y + 9, z) and the net is decribed by the equation y = V1-x - z, y 2 0, and oriented in the positive y-
direction.
(Use symbolic notation and fractions where needed.)
V. dS =
find the derivitive, r'(t), of the vector function. r(t)=a+3tb+t^7c
Consider the R − R
2
function r defined by
r (t) =
t, t2
; t ∈ [−3, 3] .
(a) Determine the vector derivative r
0
(1)
(b) Sketch the curve r together with the vector r
0
(1), in order to illustrate the geometric
meaning of the vector derivative.
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